This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 240 |
| 2 | 105856 |
| 3 | 342943680 |
| 4 | 8159542628448 |
| 5 | 1425762604012263360 |
| 6 | 1829651398830137742302620 |